package string;

public class StringAndStringBuilderDemo {
    public static void main(String[] args) {
        /*String str="a";
        for (int i=0;i<1000000;i++){
            str=str+"a";
        }
        System.out.println("执行完毕");*/
        StringBuilder builder =new StringBuilder("a");
        for(int i=0; i<1000000;i++);
        builder.append("a");
        System.out.println("执行完毕");
    }
}

